Process for the manufacture of quartz-glass from quartz-sand, &amp;c.



UNITED STATES PATENT OFFICE.

JACOB BREDEL, OF HGUHST-ON-THE-M'AIN, GERMANY PROCESS FOR THE MANUFACTURE OF QUARTZ-GLASS FROM QUARTZ-SAND, 8w.

Specification of Letters Patent.

Patented April 3, 1906.

To all whom it may concern.-

Be it known that I, JAooB BREDEL, a subject of'the German Emperor, and a resident of Hochst-on-the-Main, Germany, have invented certain new and useful Improvements in Processes for the Manufacture of Quartz- Glass from Quartz-Sand, Silica, and the Like, of which the following a specification.

This invention consists in a process for the manufacture of uartz glass from quartzsand, silica, and t e like.

Heretofore quartz-glass has been made exclusively from rock-crystal, the 'latter in small pieces, before being fused, being heated u to about 1,000 oentigrade and then quic y cooled in water. By repeating this treatment several times a substance with a very small coeflicient 'of expansion is obtained.

Were quartz-sand, silica, or the like employed as the raw material in'place of rockcrystal, and this in as pure a state as possible, treated as above described, the end inv'iew viz., the production of a glass which is practically unafiected by changes of temperaturewould not be attained, and, further, on fusion of the sand a eat number of airbubbles would be formec Quartz-glass possessing the same proper- I ties as glass made from rock-crystal can be manufactured from quartz-sand, silica, and the like by my process, which consists in fusing the raw material at an appropriate term perature into a cohesive mass, cooling said' mass, and then breaking it up into small pieces, followed by subsequent treatment exactly as with rock-crystal.

Having now fully described my said invention, what I claim, and desire to secure by Letters Patent, is-

A process for the manufacture-of quartzglass from quartz-sand, silica and the like, consisting in melting the raw material into a cohesive mass which, on cooling, is broken up into small pieces which are several times heated up to a high tem erature and then quickly cooled in water, w ereby, in the subsequent fusing operation, the formation of air-bubbles in the glass is obviated, and-a glass, practically unaffected by changes of temperature, is obtained.

In testimony whereof I have hereunto set my hand in presence of two witnesses.

JACOB BREDEL. I

Witnesses JEAN GRUND, C RL GRUND. 

